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Bioluminescence
Bioluminescence occurs when organisms convert chemical energy into visible light. This happens when a chemical reaction involving oxygen and two other molecules takes place. During this reaction, light of varying colors may be emitted. The great majority of organisms that use bioluminescence are found deep in the oceans depths. This ability to produce light serves a variety of functions. Organisms may use it to do anything from escape their predators
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| Post dates | Users | rates | Contents |
|---|---|---|---|
| 2014-04-14 | Ekhlass1980 | 80.00 | Check this speaking |
| 2014-04-14 | Ekhlass1980 | 80.00 | Check this speaking |
| 2013-11-08 | Pinky123 | 85.00 | Check this speaking |
| 2016-03-03 | saramhl | 90.00 | Check this speaking |
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- http://www.testbig.com/toefl-speaking/q518 85
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- some universities have large, lectures based classes, whereas others have smaller, discussion based classes.which do you think is better and why? include details and examples to support your explanation. 90
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- que-6 80
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The second example is short.